Centering device for tenoning and other machines



(No Model.) 2 Sheets-Sheet 2. W. H. DOANE. GENTERING DEVICE FOR TENONING AND OTHER MACHINES. No. 328,391. Patented Oct. 13, 1885.

mamas: 6 (741/ vgg )WQWWW.

N PETERS. Pholc-Lnhogmphcr. Washlnglnn. n. c.

UNITED STATES PATENT Prion.

\VILLIAM H. DOANE, OF CINCINNATI, OHIO.

CENTERING DEVICE FOR TENONING AND OTHER MACHINES SPECIFICATION forming part of Letters Patent No. 328,391 dated October 13, 1885.

Application filed August 6, 1885. Serial No. 173,722.

To aZZ whom it may concern:

Be it known that I, \VILLIAM H. DOANE, a citizen of the United States, residing at Oincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Centering Oontrivances for Tenoning and other Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

It is quite important that the tenon, as well as the miter and throat of a spoke, be so cut that their axis or center line shall coincide with the axis or center line of the spoke. In practice it is found that spoke-blanks of a given size vary somewhat in thickness, so that in tenoning or mitering or throating a lot of spokes by machines heretofore known and used, the tenons and miters and throats of some of the spokes are cut more or less out of center.

The object of my invention is to remedy this objection to these machines.

To this end my invention consists of an automatic centering contrivance, which causes every spoke to be presented to the cutterheads duly centered.

In order that my invention may be clearly understood I have illustrated in the annexed drawings, and will proceed to describe, a practical form thereof.

The drawings illustrate so much only of a spoke tenoning and mitering machine as will suffice to clearly exhibit the practical embodiment and application of my invention.

Figure 1 represents a front elevation. 2 represents a side elevation. sents a plan view.

The same letters of reference indicate identical parts in all the figures.

A refers to the upper and B to the lower tenoning and mitering cutter-heads,which are constructed and mounted in the usual way. The spoke is centered and kept centered as it is fed through between the cutter-heads, by and between the knife-edge G of a yielding lower jaw, O, and the knife-edge D of a yielding upper jaw, D. The centering-jaws, pivoted by a pin, 6, on a suitable standard, E, are

Fig. Fig. 3 repre- (No model.)

in this instance located in advance ofthe cutter-heads, and they project beyond them, so that their knife-edges may bite the spoke beyond the range of the cutters. The standard E has slots 6 e where it is bolted to the main frame or column of the machine, so that said standard can be adjusted to place the knifeedges of the jaws in proper position with reference to the cutter-heads. The knife-edges are made of sufficient length to seize the spoke before it reaches the cutter-heads, and to hold it until it has passed quite through between the cutter-heads.

Jaw O has a tail, 0*, and jaw D a tail, D. These tails diverge and terminate in eyes, through which a curved screw, F, passes loosely. The axis of the screw F is an arc struck from the center of pivot 6, so that the tails of the jaws can move on the screw without binding. The curved screw is secured to a hanger, G, which is suspended from standard E by apair of guide-bolts, g g, which err gage a curved slot, 9, in said hanger. The curve of slot 9 is an arc struck from the cen ter of pivot-pin e. Hanger G is provided with an adj usting-screw, H, which engages a fixed nut, e,on standard E,and by which the hanger may be adjusted along bolts 9 g. A clamping-bolt, 9 passing through a curved slot, 9 of the hanger into a screwed hole in standard E is provided to secure the hanger after it has been adjusted. Nutsf andf, on screw F, determine the normal distance between the knifeedges O and D, which distance should be slightly less than the thickness of the spokes to be tenoned and mitered. The tails O and D are pressed against these nutsf andf by the spiral springs I and I, thetension of which is adjustable by nutsf andf In feeding the spokes through between the knife-edges the centering-jaws are pressed apart more or less, according to the thickness of the spoke, in opposition to the springs I I, both jaws yielding practically alike, so that the spoke will be fairly centered.

It will be observed that the centering-jaws open and shut in a plane at right angles to the line of feed,while the k nifeedges are parallel to the line of feed.

The centering contrivance would be operat-ive without the adj ustable hanger,'but the presence of the latter is an advantage in facilitating the adjustments of the parts.

. It is obvious that this centering contrivance is applicable to other wood-working machines where it is desirable to center the piece in passing it through between a pair of cutterheads; also, that it can be used to so hold the spoke or piece that the cutter-heads will cut an eccentric tenon thereon, if that be required.

The parts 0' and D need not necessarily be knife-edges, because in the form of elongated bars they would operate fairly well; but I prefer to reduce their opposed edges to dull knifeedges, as shown and described.

I claim as my invention 1'. In a wood-working machinc, a centering contrivance composed of'a pair of jawsv pivoted on the machine on an axis parallel to the line of feed, and a pair of elongated bars or knife-edges attached to the jaws parallel to the axis thereof, so that in use the jaws open and shut in a plane at right angles to the line of feed, while the knifeedges are parallel to the line of feed.

2. In a woodworking machine, the combination,- substantially as before set forth, of the cutter-heads and the yieldingcentering-jaws, which are pivoted on the machine on an axis parallel to the line of feed, and which are provided with a pair of elongated bars or knifeedges extending alongside the cutter-heads.

3. The combination, substantially as before set forth, of the pivoted centering-jaws, the

screw passing through openings in the tails of 3 5 In testimony whereof I affix my signature in presence of two witnesses.

WM. H. DOANE.

Witnesses:

A. M. NEWKIRK, A. N. SPENCER. 

